Develop Reference

ScrollView not surrounding entire RelativeLayout

What I did was I added a bunch of TextViews programmatically, but now the ScrollView won't resize to fit all the new TextViews created in the onCreate() method.
onCreate():
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relative_layout);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.ALIGN_LEFT);
for (int i = 1; i < 21; i++) {
TextView number = new TextView(this);
number.setText(Integer.toString(i));
Log.i("i", Integer.toString(i));
number.setLayoutParams(lp);
number.setY(i / 2.54f * getResources().getDisplayMetrics().densityDpi);
relativeLayout.addView(number);
}
}
activity_main.xml:
<ScrollView
android:id="#+id/scroll_view"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<RelativeLayout
android:id="#+id/relative_layout"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity"/>
</ScrollView>
Is there any way to make the ScrollView fit everything inside the RelativeLayout?

Try this,
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/scroll_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:id="#+id/relative_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
</RelativeLayout>
</ScrollView>
Add this to your code,
RelativeLayout rLayout = (RelativeLayout) findViewById(R.id.relative_layout);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
TextView tv1 = new Button(this);
tv1.setText("Hello");
tv1.setLayoutParams(lp);
tv1.setId(1);
rLayout.addView(tv1);
for(int i=1;i<25;i++)
{
RelativeLayout.LayoutParams newParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
TextView tv = new Button(this);
tv.setText("Hello "+i+1);
newParams.addRule(RelativeLayout.BELOW, i);
tv.setLayoutParams(newParams);
tv.setId(2);
rLayout.addView(tv);
}

Android Add Layout View to another Layout programatically

I have a LinearLayout with Vertical orientation and I would like to add another horizontal LinearLayout with two childs.
Here is my xml layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/Gray_background"
android:orientation="vertical" >
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="10dp"
android:background="#color/GrayStroke" />
<LinearLayout
android:id="#+id/contacts_tab_menulist"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/White"
android:orientation="vertical" >
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#color/GrayStroke" /> </LinearLayout>
Here is the code which should do the job:
View rootView = inflater.inflate(R.layout.contacts_tab,
container, false);
contacts_tab_menulist = (LinearLayout) getActivity().findViewById(R.id.contacts_tab_menulist);
// add LayoutParams
LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 35);
LinearLayout listItem = new LinearLayout(getActivity());
listItem.setLayoutParams(lparams);
listItem.setOrientation(LinearLayout.HORIZONTAL);
AspectRatioImageView icon = new AspectRatioImageView(getActivity());
LinearLayout.LayoutParams ic_params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 25);
icon.setImageResource(R.drawable.contacts_add_contact);
icon.setLayoutParams(ic_params);
listItem.addView(icon);
TextView title = new TextView(getActivity());
LinearLayout.LayoutParams t_params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
title.setText("Add Contact");
title.setId(0);
title.setLayoutParams(t_params);
listItem.addView(title);
contacts_tab_menulist.addView(listItem);
return rootView;
I get a nullPointerException on contacts_tab_menulist.addView(listItem). What am I doing wrong?

Try replacing
contacts_tab_menulist = (LinearLayout) getActivity().findViewById(R.id.contacts_tab_menulist);
with
contacts_tab_menulist = (LinearLayout) rootView.findViewById(R.id.contacts_tab_menulist);

Get the view from your inflated view, since inflating the View does not mean its the current activities view:
contacts_tab_menulist = (LinearLayout) rootView.findViewById(R.id.contacts_tab_menulist);

Generation code from xml layout

For example, I have some layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="test">
</TextView>
</LinearLayout>
I want generate code from layout:
LinearLayout layout = new LinearLayout(context);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
layout.setLayoutParams(lp);
layout.setOrientation(LinearLayout.VERTICAL);
TextView textview = new TextView(context);
lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
layout.setLayoutParams(lp);
textview.setText("test");
layout.addView(textview);
Can anybody know tools for this?

Programmatic RelativeLayout overlapping

I have got a problem by implementing relative layout from code.
What I want, that TextView1 is located to the left, and TextView2 to the right of the screen at one line.
It works fine from XML, but doing this from code do not... what could be the reason?
This work just fine:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="#string/hello_world" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="TextView" />
</RelativeLayout>
This doesn't work(giving an overlapping of elements):
RelativeLayout rel = new RelativeLayout(this);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
rel.setLayoutParams(params);
TextView t1 = new TextView(this);
t1.setText("balbla_1");
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
lp1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
t1.setLayoutParams(lp1);
TextView t2 = new TextView(this);
t2.setText("balbla_2");
RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
lp2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
t2.setLayoutParams(lp2);
rel.addView(t1);
rel.addView(t2);
setContentView(rel);
but this would work fine: (replace MATCH_PARENT with WRAP_CONTENT):
RelativeLayout rel = new RelativeLayout(this);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
rel.setLayoutParams(params);
TextView t1 = new TextView(this);
t1.setText("balbla_1");
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
lp1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
t1.setLayoutParams(lp1);
TextView t2 = new TextView(this);
t2.setText("balbla_2");
RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
lp2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
t2.setLayoutParams(lp2);
rel.addView(t1);
rel.addView(t2);
setContentView(rel);

The Java code is not an exact match to the XML, the overlapping is because you have forgotten:
lp2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
You have also neglected:
lp1.addRule(RelativeLayout.CENTER_VERTICAL);
And you are using MATCH_PARENT for the widths instead of WRAP_CONTENT.

How to align ImageView to the right side of the LinearLayout Programmatically android

i want to align an ImageView to the right side of the LinearLayout Programmatically.How can i do this.

You don't. That is not what a linear layout does. Use a RelativeLayout instead.
XML
<RelativeLayout android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello, World!"
android:layout_alignParentRight="true"/>
</RelativeLayout>
Programmatically
public void makeView(Context context) {
RelativeLayout rl = new RelativeLayout(context);
TextView tv = new TextView(context);
tv.setText("Hello, World");
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams
(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
rl.addView(tv, lp);
}

You can try this:
ImageView view = (ImageView)findViewById(R.id.imageView);
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.LEFT;
But you should use RelativeLayout instead of LinearLayout.